Verify that the nonempty set G with the given operation * is a group. Is G abelian (prove or disprove)? (a) G = Z where a * b = a + b - 1 for all a, b e G (b) G = {r € Q| r> 0} where a b = for all a, b e G (c) G = R\{1} where a * b = a – ab + b for all a, b eG

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